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WAEC Mathematics 2003 Question 22

Question 22

Angles and Polygons

The four interior angles of a quadrilateral are (x + 20)°, (x + 10)° (2x − 45)° and (x − 25)°. Find the value of x

  1. A.60
  2. B.80
  3. C.100
  4. D.360
Show the answer and explanation

Answer: B (80)

Explanation

The angles add to 360°: 5x − 40 = 360, so x = 80.